The interface is purified, only the essential appears: your text and your pdf.
TexitEasy has all the features you need, from full syntactic coloration to spell checker. It also support the lastest Tex directives (root, program, spellchecker and encoding).
TexitEasy uses Qt library and you can find binaries are compiled for Windows, OS X and a lots of GNU/Linux distributions.
With pre-installed macros like
Ctrl + E you can create begin/end environment really fast.
Write your own macro.